Denshi Jisho — Online Japanese dictionary

空 くう 1: empty air; sky;
2:
3: (Buddhist term) shunya (emptiness, the lack of an immutable intrinsic nature within any phemomenon);
4: (Abbreviation) air force; () fruitlessness; meaninglessness;
5: void (one of the five elements)
Noun 
食う くう 1: (Male term or language) (Vulgar expression or word) to eat;
2: to live; to make a living; to survive;
3: to bite; to sting (as insects do);
4: to tease; to torment; to taunt; to make light of; to make fun of;
5: to encroach on; to eat into; to consume;
6: to defeat a superior; to threaten a position;
7: to consume time and-or resources;
8: (Colloquialism) to receive something (usu. an unfavourable event);
9: (Male term or language) (Vulgar expression or word) to have sexual relations with a woman, esp. for the first time
Common word, Godan verb with u ending, Transitive verb 
食い くい 1: eating;
2: bite (in fishing)
Noun 
啖う くう 1: (Male term or language) (Vulgar expression or word) to eat;
2: to live; to make a living; to survive;
3: to bite; to sting (as insects do);
4: to tease; to torment; to taunt; to make light of; to make fun of;
5: to encroach on; to eat into; to consume;
6: to defeat a superior; to threaten a position;
7: to consume time and-or resources;
8: (Colloquialism) to receive something (usu. an unfavourable event);
9: (Male term or language) (Vulgar expression or word) to have sexual relations with a woman, esp. for the first time
Out-dated kanji, Godan verb with u ending, Transitive verb 
喰う くう 1: (Male term or language) (Vulgar expression or word) to eat;
2: to live; to make a living; to survive;
3: to bite; to sting (as insects do);
4: to tease; to torment; to taunt; to make light of; to make fun of;
5: to encroach on; to eat into; to consume;
6: to defeat a superior; to threaten a position;
7: to consume time and-or resources;
8: (Colloquialism) to receive something (usu. an unfavourable event);
9: (Male term or language) (Vulgar expression or word) to have sexual relations with a woman, esp. for the first time
Godan verb with u ending, Transitive verb 
食み はみ eating (fodder, grass, etc.)
Noun 
食む はむ 1: (Usually written using kana alone) (Archaism) to eat (fodder, grass, etc.);
2: to receive (a salary);
3: to receive a stipend from one's lord
Godan verb with mu ending 
食 しょく 1: meal; (one's) diet; food; foodstuff; foodstuffs;
2: eclipse (solar, lunar, etc.)
Common word, Noun 
空気 くうき air; atmosphere
Common word, Noun 
空疎 くうそ vain; groundless; futile
Common word, Na-adjective, Noun 
空母 くうぼ aircraft carrier
Common word, Noun, Abbreviation 
空輸 くうゆ air transport
Common word, Noun, Suru verb, No-adjective 
空路 くうろ air lane
Common word, Adverbial noun, Temporal noun 
空位 くうい vacant post; post in name only
Noun 
空尉 くうい (Self Defense Force's Air Force) captain (defence); lieutenant
Noun 
供花 くうげ offering of flowers (at shrine, grave, etc.); floral tribute
Noun 
供華 くうげ offering of flowers (at shrine, grave, etc.); floral tribute
Noun 
空狐 くうこ second-ranking fox spirit
Noun 
箜篌 くうご konghou (ancient Chinese harp)
Noun 
空佐 くうさ (Self Defense Force's Air Force) colonel (defence); lieutenant; major
Noun 
空地 くうち vacant land
Noun 
空費 くうひ wastefulness
Noun, Suru verb 
空理 くうり abstract or impracticable theory
Noun 
食らう くらう 1: (Vulgar expression or word) to eat; to drink;
2: to receive (e.g. a blow)
Common word, Godan verb with u ending, Transitive verb 
食べる たべる 1: to eat;
2: to live on (e.g. a salary); to live off; to subsist on
Common word, Ichidan verb, Transitive verb 
食い気 くいけ appetite
Noun 

Found 508 words. Page one, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

You can also

Look up kanji details for 食 くう.

Try a Yahoo Jisho search for 食 くう .
Try a Goo Jisho search for 食 くう .
Try a Google search for 食 くう .